Dosing system

Abstract

This application belongs to the technical field of emergency chemical dosing for power plant circulating cooling water, specifically providing a dosing system. The system includes a chemical storage pit, a power supply unit, a chemical storage container, a return pipeline, and a dosing pipeline. The chemical storage pit is located below ground level, while the chemical storage container is located above ground level. Both ends of the return pipeline are connected to the chemical storage container and the chemical storage pit, respectively. One end of the dosing pipeline is connected to the chemical storage container. When it is necessary to deliver chemicals to the dosing area, the power supply unit transports the chemicals from the chemical storage pit to the chemical storage container, and then the chemicals are delivered to the dosing area through the dosing pipeline. When it is not necessary to deliver chemicals to the dosing area, the chemicals in the chemical storage container flow back to the chemical storage pit along the return pipeline. This prevents the chemical storage container from storing corrosive chemicals for extended periods, making it less susceptible to corrosion and sealing failure, thus effectively preventing chemicals from leaking onto the ground and corroding on-site equipment and harming human health.

Description

Technical Field

[0001] This application belongs to the field of emergency chemical dosing technology for power plant circulating cooling water, specifically relating to a chemical dosing system. Background Technology

[0002] The emergency chemical dosing system for circulating cooling water in power plants is a crucial facility for ensuring the stable operation of generating units. Sodium hypochlorite, a commonly used oxidizing disinfectant, plays a vital role in emergency dosing. However, currently, power plants typically place storage tanks for sodium hypochlorite solution on the ground. Sodium hypochlorite solution is a strong oxidizing agent, and long-term storage can easily corrode the tanks, leading to seal failure and leakage. Leaked sodium hypochlorite may flow into sump pits and react with hydrochloric acid discharged into the pits to produce chlorine gas. Chlorine gas is a highly toxic gas with strong irritant and corrosive properties, which can not only corrode on-site equipment but also harm human health. Utility Model Content

[0003] The purpose of this application is to provide a dosing system that addresses the technical problem of sodium hypochlorite solution leaking onto the ground in existing dosing systems.

[0004] To achieve the above objectives, the technical solution adopted in this application is: a drug dosing system, including a drug storage pit, a drug delivery power unit, a drug storage container, a return pipeline, and a drug delivery pipeline. The drug storage pit is located below ground level, the drug storage container is located above ground level, the drug delivery power unit is used to transport the drug in the drug storage pit to the drug storage container, the two ends of the return pipeline are respectively connected to the drug storage container and the drug storage pit, and one end of the drug delivery pipeline is connected to the drug storage container.

[0005] Furthermore, the dosing system also includes a detection component, which is located in the drug storage pit. The detection component includes a liquid concentration detection unit and / or a gas detection unit.

[0006] Furthermore, the dosing system also includes a control unit and a ventilation device, with the ventilation device located above ground and the control unit electrically connected to the detection components and the ventilation device.

[0007] Furthermore, the dosing system also includes a control unit and an alarm device. The alarm device is located above ground, and the control unit is electrically connected to the detection components and the alarm device. The alarm device includes a sound unit and / or a light-emitting unit.

[0008] Furthermore, the dosing system also includes an installation pit, which is located below ground level and separated from the drug storage pit, and the dosing power unit is located in the installation pit; the dosing system also includes a first dosing pipeline and a second dosing pipeline, the two ends of the first dosing pipeline being connected to the drug storage pit and the dosing power unit respectively, and the two ends of the second dosing pipeline being connected to the dosing power unit and the drug storage container respectively.

[0009] Furthermore, the dosing system also includes a sealing cover plate, which covers the top opening of the drug storage pit. The sealing cover plate is provided with a connection hole, and the end of the return pipeline away from the drug storage container is connected to the drug storage pit through the connection hole.

[0010] Furthermore, the dosing system also includes a dike, which is set on the ground and surrounds the drug storage container, and the sealing cover is provided with a return hole located inside the dike.

[0011] Furthermore, the dosing system also includes a first valve, which is located on the return line.

[0012] Furthermore, one end of the dosing pipeline is connected to the bottom of the drug storage container.

[0013] Furthermore, the inner wall of the medicine storage pit is lined with a layer of corrosion-resistant material.

[0014] Compared with existing technologies, the beneficial effects of the dosing system provided in this application are as follows: When it is necessary to deliver drugs to the dosing area, the drug stored in the storage pit is transported to the storage container by the dosing power device, and then the drug in the storage container is delivered to the dosing area through the dosing pipeline. When it is not necessary to deliver drugs to the dosing area, the drug in the storage container flows back to the storage pit along the return pipeline, avoiding the storage container from storing corrosive drugs for a long time. This makes the storage container less susceptible to drug corrosion and sealing failure, thus effectively preventing drug leakage to the ground and corrosion of on-site equipment and harm to human health. In addition, allowing the drug in the storage container to flow back to the storage pit along the return pipeline can also prevent the drug from deteriorating due to environmental factors such as light exposure and high temperature caused by long-term storage in the storage container, thereby reducing economic losses. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the dosing system provided in the embodiments of this application; Figure 2 A structural diagram showing the fit between the sealing cover, the drug storage container, and the dike of the dosing system provided in the embodiments of this application; Figure 3 The diagram shows the electrical connections of the detection components, control unit, ventilation device, and alarm device of the dosing system provided in the embodiments of this application.

[0017] The following are the labeling elements in the figure: 10. Drug storage pit; 20. Drug supply power unit; 30. Drug storage container; 40. Return pipeline; 50. Drug supply pipeline; 60. Detection component; 70. Control unit; 80. Ventilation device; 90. Alarm device; 100. Installation pit; 110. First drug supply pipeline; 120. Second drug supply pipeline; 130. Sealing cover; 140. Dike; 150. One-way guide; 160. First valve; 170. Second valve; 180. Drug supply power unit. Detailed Implementation

[0018] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0019] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0021] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] like Figure 1 As shown in the figure, this application provides a drug dosing system, including a drug storage pit 10, a drug delivery power unit 20, a drug storage container 30, a return pipeline 40, and a drug delivery pipeline 50. The drug storage pit 10 is located below ground level, and the drug storage container 30 is located above ground level. The drug delivery power unit 20 is used to transport the drug in the drug storage pit 10 to the drug storage container 30. The two ends of the return pipeline 40 are respectively connected to the drug storage container 30 and the drug storage pit 10. One end of the drug delivery pipeline 50 is connected to the drug storage container 30.

[0023] When medication needs to be delivered to the dosing area, the power unit 20 transports the medication stored in the storage pit 10 to the storage container 30. Then, the medication in the storage container 30 is delivered to the dosing area via the dosing pipeline 50. When medication is not needed, the medication in the storage container 30 flows back to the storage pit 10 via the return pipeline 40. This prevents the storage container 30 from storing corrosive medication for extended periods, thus reducing the risk of seal failure due to corrosion and effectively preventing medication leakage to the ground, which could corrode equipment and harm human health. Furthermore, the return pipeline 40 prevents the medication from deteriorating due to exposure to light, high temperatures, and other environmental factors, thus minimizing economic losses.

[0024] The application scenario of the dosing system provided in this embodiment is not limited. For example, the end of the dosing pipeline 50 furthest from the storage container 30 can be connected to the cooling water circulation system of a power plant. By adding chemicals to the cooling water, good water quality can be maintained, thereby ensuring the normal operation of the cooling water circulation system. The type of chemical can be selected according to actual needs. For example, sodium hypochlorite solution can be used. Sodium hypochlorite is a commonly used oxidizing bactericide. By adding sodium hypochlorite solution to the cooling water, it can sterilize and disinfect, oxidize and decompose organic matter, remove color and odor, inhibit the formation of algae and biofilm, and protect metal surfaces. Sodium hypochlorite solution has strong oxidizing properties. Long-term storage in the storage container 30 can easily corrode the storage container 30, causing the storage container 30 to fail to seal and resulting in sodium hypochlorite leakage. Hydrochloric acid is often discharged into the power plant's sump. Sodium hypochlorite leaked to the ground may flow into the sump and react with the hydrochloric acid to produce chlorine gas. Chlorine gas is a highly toxic gas with strong irritant and corrosive properties, which can not only corrode on-site equipment but also harm human health. When no chemicals are needed in the cooling water circulation system, the sodium hypochlorite solution in the storage container 30 is drained into the storage pit 10 via the return pipe 40. This prevents the storage container 30 from storing sodium hypochlorite solution for extended periods, making it less susceptible to corrosion and sealing failure. This effectively prevents the sodium hypochlorite solution from leaking onto the ground and reacting with hydrochloric acid to produce chlorine gas. The capacity of the storage pit 10 can be designed according to actual needs. Based on the dosing requirements and emergency reserve requirements of the power plant's circulating cooling water emergency chemical dosing system, the capacity of the storage pit 10 should meet at least two days' emergency needs. Assuming a sodium hypochlorite solution concentration of 10% and a daily consumption of 15,000 kg, the designed capacity of the storage pit 10 would be approximately 30,000 kg.

[0025] When medication needs to be injected into the storage pit 10, a pipeline connects the tanker truck on the ground to the storage pit 10. Since the height of the tanker truck is greater than that of the storage pit 10, the medication can automatically flow from the tanker truck into the storage pit 10 via gravity. Similarly, since the height of the storage container 30 is greater than that of the storage pit 10, the medication can automatically flow from the storage container 30 into the storage pit 10 via the return pipeline 40 via gravity. By utilizing gravity to automatically flow the medication into the storage pit 10, there is no need to use a discharging pump to pump the medication into the storage pit 10, thus avoiding the risk of medication leakage during the unloading process.

[0026] In some embodiments, such as Figure 3As shown, the dosing system also includes a detection component 60, which is installed within the drug storage pit 10. The detection component 60 includes a liquid concentration detection unit and / or a gas detection unit. By installing the liquid concentration detection unit within the drug storage pit 10 and immersing it in the drug, the concentration of the drug can be detected, thus achieving drug concentration monitoring. By installing the gas detection unit within the drug storage pit 10, the presence and concentration of toxic gases within the pit can be detected. Specifically, when the drug is a sodium hypochlorite solution, a sodium hypochlorite concentration sensor is used for the liquid concentration detection unit, and a chlorine detector is used for the gas detection unit. When sodium hypochlorite reacts with hydrochloric acid, chlorine, sodium chloride, and water are produced. The concentration of sodium hypochlorite decreases, while the concentration of chlorine increases. By monitoring the concentrations of sodium hypochlorite and / or chlorine, personnel can take timely countermeasures.

[0027] In some embodiments, such as Figure 3 As shown, the dosing system also includes a control unit 70 and a ventilation device 80. The ventilation device 80 is located above ground level, and the control unit 70 is electrically connected to the detection component 60 and the ventilation device 80. During operation, the detection results from the detection component 60 are sent to the control unit 70, which then controls the ventilation device 80 to start or stop based on these results. When toxic gases are generated in the storage pit 10, these gases may enter the area above ground level, potentially harming on-site equipment and human health. When the liquid concentration detection unit of the detection component 60 detects an abnormal drug concentration and / or the gas detection unit of the detection component 60 detects the generation of toxic gases, the control unit 70 activates the ventilation device 80 to quickly dilute the concentration of toxic gases above ground level, thereby preventing harm to on-site equipment and human health.

[0028] In some embodiments, such as Figure 3As shown, the dosing system also includes an alarm device 90, which is installed above ground. A control unit 70 is electrically connected to the detection component 60 and the alarm device 90. The alarm device 90 includes a sound unit and / or a light-emitting unit. During operation, the detection results from the detection component 60 are sent to the control unit 70, which controls the alarm device 90 to start and stop based on the detection results. When toxic gas is generated in the storage pit 10, the toxic gas may enter the area above ground, causing damage to on-site equipment and human health. When the liquid concentration detection unit of the detection component 60 detects an abnormal drug concentration and / or the gas detection unit of the detection component 60 detects the generation of toxic gas, the control unit 70 controls the alarm device 90 to activate to alert personnel, allowing them to take timely countermeasures, such as evacuating people or activating the ventilation device 80. The alarm device 90 may include one or both of a sound unit and a light-emitting unit; the sound unit emits an alarm sound, and the light-emitting unit emits an alarm light.

[0029] In some embodiments, such as Figure 1 As shown, the dosing system also includes an installation pit 100, which is located below ground level and separated from the drug storage pit 10. The dosing power unit 20 is installed within the installation pit 100. The dosing system also includes a first dosing pipeline 110 and a second dosing pipeline 120. The two ends of the first dosing pipeline 110 are connected to the drug storage pit 10 and the dosing power unit 20, respectively. The two ends of the second dosing pipeline 120 are connected to the dosing power unit 20 and the drug storage container 30, respectively. By setting up the installation pit 100 below ground level and placing the dosing power unit 20 within it, while separating the installation pit 100 from the drug storage pit 10, the dosing power unit 20 is prevented from being immersed in the drug, thus preventing the drug from corroding the surface of the dosing power unit 20. By setting up a first drug supply pipeline 110 to connect the drug supply power unit 20 and the drug storage pit 10, the drug in the drug storage pit 10 can flow to the drug supply power unit 20 through the first drug supply pipeline 110. By setting up a second drug supply pipeline 120 to connect the drug supply power unit 20 and the drug storage container 30, the drug flowing to the drug supply power unit 20 can flow into the drug storage container 30 through the second drug supply pipeline 120. When the drug supply power unit 20 is activated, the drug in the drug storage pit 10 can flow into the drug storage container 30 sequentially through the first drug supply pipeline 110, the drug supply power unit 20, and the second drug supply pipeline 120. The type of drug supply power unit 20 is not limited; a pump can be used, specifically a corrosion-resistant, low-noise shielded pump. The first drug supply pipeline 110, the second drug supply pipeline 120, the return pipeline 40, and the drug supply pipeline can all be made of corrosion-resistant materials, such as titanium alloy, PVC, or Hastelloy. Drug leakage detection devices and emergency isolation valves can be installed at key nodes of the above pipelines.

[0030] In some embodiments, such as Figure 1 As shown, the dosing system also includes a sealing cover 130, which is located at the top opening of the drug storage pit 10. The sealing cover 130 has a connection hole, through which the end of the return pipe 40 away from the drug storage container 30 is connected to the drug storage pit 10. It should be noted that the end of the return pipe 40 away from the drug storage container 30 can be located at the connection hole, or it can extend into the drug storage pit 10 through the connection hole. By installing a sealing cover 130 at the top opening of the drug storage pit 10, it is possible to prevent debris on the ground from falling into the drug storage pit 10 and contaminating the drugs, and at the same time, it is possible to prevent workers on the ground from accidentally falling into the drug storage pit 10, thus ensuring the personal safety of the workers. Specifically, when the drug in the storage pit 10 is a sodium hypochlorite solution, a sealing cover 130 is installed at the top opening of the storage pit 10 to prevent hydrochloric acid on the ground from flowing into the storage pit 10 and reacting with sodium hypochlorite to produce chlorine gas. This avoids the problem of damage to on-site equipment and human health caused by the production of chlorine gas. An opening in the sealing cover 130 allows the end of the return pipe 40 away from the storage container 30 to pass through the sealing cover 130 and extend into the storage pit 10, thus ensuring that the drug in the storage container 30 flows into the storage pit 10 through the return pipe 40. A safety warning sign can be installed above the sealing cover 130 to prevent personnel from accidentally entering.

[0031] In some embodiments, such as Figure 2 As shown, the dosing system also includes a dike 140, which is set on the ground and surrounds the storage container 30. A reflux hole is provided on the sealing cover 130, located within the dike 140. By setting the dike 140 on the ground and surrounding the storage container 30, leaked drugs can be prevented from spreading to other areas, such as preventing leaked sodium hypochlorite solution from diffusing outwards and reacting with hydrochloric acid on the ground to produce chlorine gas. By providing a reflux hole on the sealing cover 130, located within the dike 140, leaked drugs within the dike 140 can flow downwards into the storage pit 10 under gravity, achieving the collection and reuse of leaked drugs and reducing drug loss.

[0032] In some embodiments, such as Figure 2 As shown, a one-way guide 150 is installed in the reflux hole. The one-way guide 150 allows the drug on the ground to flow into the drug storage pit 10, while preventing the drug in the drug storage pit 10 from flowing to the ground. For example, it prevents the sodium hypochlorite solution in the drug storage pit 10 from flowing to the ground and reacting with hydrochloric acid to produce chlorine gas. Specifically, the one-way guide 150 can be a check valve.

[0033] In some embodiments, such as Figure 1As shown, the dosing system also includes a first valve 160, which is installed on the return pipe 40. By installing the first valve 160 on the return pipe 40, the opening and closing of the return pipe 40 can be controlled. When the drug stored in the storage pit 10 is transported to the storage container 30 by the dosing power unit 20, the first valve 160 is closed to prevent the drug flowing into the storage container 30 from flowing back into the storage pit 10 along the return pipe 40, thus ensuring that the drug in the storage container 30 can be transported to the dosing area via the dosing pipe 50. When the transport of the drug in the storage container 30 to the dosing area is stopped, the first valve 160 is opened, allowing the drug in the storage container 30 to flow back into the storage pit 10 along the return pipe 40, thus preventing the storage container 30 from storing the drug for an extended period.

[0034] In some embodiments, such as Figure 1 As shown, the end of the return pipe 40 furthest from the drug storage pit 10 is connected to the bottom of the drug storage container 30. By connecting the end of the return pipe 40 furthest from the drug storage pit 10 to the bottom of the drug storage container 30, as much drug as possible can flow into the drug storage pit 10, minimizing the amount of drug residue in the drug storage container 30, thereby making the drug storage container 30 less susceptible to drug corrosion.

[0035] In some embodiments, such as Figure 1 As shown, the dosing system also includes a second valve 170, which is installed on the dosing pipeline 50. By installing the second valve 170 on the dosing pipeline 50, the on / off state of the dosing pipeline 50 can be controlled. When it is necessary to deliver medication to the dosing area, the second valve 170 is opened, allowing the medication in the storage container 30 to be delivered to the dosing area along the dosing pipeline 50. When it is not necessary to deliver medication to the dosing area, the second valve 170 is closed, and the first valve 160 is opened, allowing the medication in the storage container 30 to flow back to the storage pit 10 along the return pipeline 40.

[0036] In some embodiments, such as Figure 1 As shown, one end of the dosing line 50 is connected to the bottom of the drug storage container 30. By connecting one end of the dosing line 50 to the bottom of the drug storage container 30, the drug inside the storage container 30 can automatically flow along the dosing line 50 to the drug delivery area under the influence of gravity. Compared to using a dosing pump to transport the drug in the storage container 30 to the drug delivery area along the dosing line 50, using the drug's own weight for delivery avoids fluctuations caused by the characteristics of the dosing pump, making the drug delivery more stable and smooth, thereby reducing the possibility of drug leakage.

[0037] In some embodiments, such as Figure 1As shown, the dosing system also includes a dosing power unit 180, which is installed on the dosing pipeline 50 and is used to transport the drug from the storage container 30 along the dosing pipeline 50 to the drug delivery area. The type of dosing power unit 180 is not limited, and a pump can be used.

[0038] In some embodiments, the inner wall of the drug storage pit 10 is provided with a corrosion-resistant material layer. By providing a corrosion-resistant material layer on the inner wall of the drug storage pit 10, the drug storage pit 10 acquires corrosion-resistant properties, thereby meeting the requirements for long-term storage of corrosive drugs. Specifically, the corrosion-resistant material layer can be an epoxy resin layer. The outer base of the drug storage pit 10 can be a reinforced concrete structure.

[0039] In some embodiments, the inner wall of the drug storage pit 10 is provided with a waterproof layer, which can prevent groundwater from seeping into the drug storage pit 10 and mixing with the drugs, and at the same time prevent the drugs in the drug storage pit 10 from seeping into the ground.

[0040] It should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A dosing system, characterized in that, The device includes a drug storage pit, a drug delivery power unit, a drug storage container, a return pipeline, and a drug delivery pipeline. The drug storage pit is located below ground level, and the drug storage container is located above ground level. The drug delivery power unit is used to transport the drug from the drug storage pit to the drug storage container. The two ends of the return pipeline are connected to the drug storage container and the drug storage pit, respectively, and one end of the drug delivery pipeline is connected to the drug storage container.

2. The dosing system according to claim 1, characterized in that: The dosing system also includes a detection component, which is located in the drug storage pit. The detection component includes a liquid concentration detection unit and / or a gas detection unit.

3. The dosing system according to claim 2, characterized in that: The dosing system also includes a control unit and a ventilation device, the ventilation device being installed above ground, and the control unit being electrically connected to the detection component and the ventilation device.

4. The dosing system according to claim 2, characterized in that: The dosing system also includes a control unit and an alarm device. The alarm device is located above ground. The control unit is electrically connected to the detection component and the alarm device. The alarm device includes a sound unit and / or a light-emitting unit.

5. The dosing system according to claim 1, characterized in that: The dosing system further includes an installation pit, which is located below the ground and separated from the drug storage pit, and the dosing power unit is located in the installation pit; the dosing system also includes a first dosing pipeline and a second dosing pipeline, the two ends of the first dosing pipeline being connected to the drug storage pit and the dosing power unit respectively, and the two ends of the second dosing pipeline being connected to the dosing power unit and the drug storage container respectively.

6. The dosing system according to claim 1, characterized in that: The dosing system also includes a sealing cover plate, which covers the top opening of the drug storage pit. The sealing cover plate has a connection hole, and the end of the return pipeline away from the drug storage container is connected to the drug storage pit through the connection hole.

7. The dosing system according to claim 6, characterized in that: The dosing system also includes a dike, which is set on the ground and surrounds the drug storage container. The sealing cover is provided with a reflux hole, which is located inside the dike.

8. The dosing system according to any one of claims 1-7, characterized in that: The dosing system also includes a first valve, which is located on the return pipeline.

9. The dosing system according to any one of claims 1-7, characterized in that: One end of the dosing pipeline is connected to the bottom of the drug storage container.

10. The dosing system according to any one of claims 1-7, characterized in that: The inner wall of the medicine storage pit is lined with a corrosion-resistant material layer.

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